quick question on difference between p85d and regular 85d. is the only difference between them the power of motor? are there any interior/exterior differences? when i check the info on 85d, It's stated that it has 259hp front and rear motor. combined to 518 hp total. but on the ordering page 417 hp total stated, so I'm a bit confused can someone help me out? I'm sure this has been asked many times before, but just couldnt't find the answers.